PING woori21.org (222.231.2.20) 56(84) bytes of data.
64 bytes from b20.nskorea.com (222.231.2.20): icmp_seq=1 ttl=53 time=262 ms
64 bytes from b20.nskorea.com (222.231.2.20): icmp_seq=2 ttl=53 time=262 ms
64 bytes from b20.nskorea.com (222.231.2.20): icmp_seq=3 ttl=53 time=262 ms

--- woori21.org ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2001ms
rtt min/avg/max/mdev = 262.293/262.373/262.499/0.598 ms